modify album tag through config on import?

[BLovegrove]

As the title says - scoured the github pages and the net in general for days trying to find a solution to get plex to play well with my music collection. The issue is, for albums that involve multiple artists beets is saving the artist tag as 'Artist1 & Artist2' which plex will display as its own artist, which has no art, splits up the albums, etc. Is there some way I've missed to alter that so the primary artist is the only one saved to the main 'Artist' tag, and the other(s) get saved to the 'Artists' tag separated by ';' as picard does it for example? Even if I can just drop the other artists for now.

I've seen a few similar posts but they all center around the folder name which I've already tackled with a bit of code using the inline plugin that grabs the primary artist and sets the folder name to that. Maybe that could be expanded to change the artist tag as well? so far I haven't seen anything at all that indicates I can without altering beets itself hence me being here (':

Should also mention, using picard to manually add a new tag, the 'Artists' field containing 'Artist1; Artist2; etc.' even without modifying the main Artist tag, makes plex play nice! Being able to automate this on import in any capacity would also fix my issue but I'm not sure beets has anything built in for this? Not that I can find anyway.

Thanks in advance!